Re: BUG-lockdep and freeze (was: Arrr! Linux 2.6.18)

["Eric Rannaud" <eric.rannaud@gmail.com>]

On 9/30/06, Andrew Morton <akpm@osdl.org> wrote:
> You could set CONFIG_UNWIND_INFO=n and CONFIG_STACK_UNWIND=n and reenable
> lockdep.  That will a) tell us if there's some lockdep problem and b) will
> give us a clearer look at any locking problems which your kernel is
> detecting.


All right. Here is the stacktrace I get with config
CONFIG_UNWIND_INFO=n and CONFIG_STACK_UNWIND=n and v2.6.18 (all the
rest being equal  http://engm.ath.cx/kernel/config-2.6.18). (and no
freeze)


[  153.552157] BUG: warning at
kernel/lockdep.c:565/print_infinite_recursion_bug()
[  153.552252]
[  153.552253] Call Trace:
[  153.552346]  [<ffffffff8024b84d>] print_infinite_recursion_bug+0x3d/0x50
[  153.552398]  [<ffffffff8024b95f>] find_usage_backwards+0x2f/0xd0
[  153.552447]  [<ffffffff8024b9c3>] find_usage_backwards+0x93/0xd0
[  153.552496]  [<ffffffff8024b9c3>] find_usage_backwards+0x93/0xd0
[  153.552545]  [<ffffffff8024b9c3>] find_usage_backwards+0x93/0xd0
[  153.552594]  [<ffffffff8024b9c3>] find_usage_backwards+0x93/0xd0
[  153.552643]  [<ffffffff8024b9c3>] find_usage_backwards+0x93/0xd0
[  153.552704]  [<ffffffff8024b9c3>] find_usage_backwards+0x93/0xd0
[  153.552767]  [<ffffffff8024b9c3>] find_usage_backwards+0x93/0xd0
[  153.552835]  [<ffffffff8024b9c3>] find_usage_backwards+0x93/0xd0
[  153.552896]  [<ffffffff8024b9c3>] find_usage_backwards+0x93/0xd0
[  153.552958]  [<ffffffff8024b9c3>] find_usage_backwards+0x93/0xd0
[  153.553019]  [<ffffffff8024b9c3>] find_usage_backwards+0x93/0xd0
[  153.553081]  [<ffffffff8024b9c3>] find_usage_backwards+0x93/0xd0
[  153.553145]  [<ffffffff8024b9c3>] find_usage_backwards+0x93/0xd0
[  153.553206]  [<ffffffff8024b9c3>] find_usage_backwards+0x93/0xd0
[  153.553268]  [<ffffffff8024b9c3>] find_usage_backwards+0x93/0xd0
[  153.553330]  [<ffffffff8024b9c3>] find_usage_backwards+0x93/0xd0
[  153.553392]  [<ffffffff8024b9c3>] find_usage_backwards+0x93/0xd0
[  153.553454]  [<ffffffff8024b9c3>] find_usage_backwards+0x93/0xd0
[  153.553515]  [<ffffffff8024b9c3>] find_usage_backwards+0x93/0xd0
[  153.553578]  [<ffffffff8024b9c3>] find_usage_backwards+0x93/0xd0
[  153.553643]  [<ffffffff804aa97a>] trace_hardirqs_on_thunk+0x35/0x37
[  153.553706]  [<ffffffff8024c370>] check_usage+0x40/0x2b0
[  153.553768]  [<ffffffff8024dc40>] __lock_acquire+0xa50/0xd20
[  153.553830]  [<ffffffff8024de2f>] __lock_acquire+0xc3f/0xd20
[  153.553894]  [<ffffffff80227c2b>] double_rq_lock+0x2b/0x50
[  153.553955]  [<ffffffff8024e29b>] lock_acquire+0x8b/0xc0
[  153.554016]  [<ffffffff80227c2b>] double_rq_lock+0x2b/0x50
[  153.554077]  [<ffffffff804aae25>] _spin_lock+0x25/0x40
[  153.554138]  [<ffffffff80227c2b>] double_rq_lock+0x2b/0x50
[  153.554199]  [<ffffffff8022af8b>] migration_thread+0x22b/0x2e0
[  153.554260]  [<ffffffff8022ad60>] migration_thread+0x0/0x2e0
[  153.554322]  [<ffffffff80246b9a>] kthread+0xda/0x110
[  153.554384]  [<ffffffff8020aaa0>] child_rip+0xa/0x12
[  153.554443]  [<ffffffff804ab30b>] _spin_unlock_irq+0x2b/0x40
[  153.554507]  [<ffffffff8020a0dc>] restore_args+0x0/0x30
[  153.554568]  [<ffffffff80246ac0>] kthread+0x0/0x110
[  153.554628]  [<ffffffff8020aa96>] child_rip+0x0/0x12


Thanks.
er.
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